[PATCH] Reduce the number of connects when fetching

@@ -7,6 +7,7 @@
 #include "pack.h"
 #include "sideband.h"
 #include "fetch-pack.h"
+#include "remote.h"
 #include "run-command.h"
 
 static int transfer_unpack_limit = -1;

@@ -548,14 +549,14 @@ static int get_pack(int xd[2], char **pack_lockfile)
 }
 
 static struct ref *do_fetch_pack(int fd[2],
+		const struct ref *orig_ref,
 		int nr_match,
 		char **match,
 		char **pack_lockfile)
 {
-	struct ref *ref;
+	struct ref *ref = copy_ref_list(orig_ref);
 	unsigned char sha1[20];
 
-	get_remote_heads(fd[0], &ref, 0, NULL, 0);
 	if (is_repository_shallow() && !server_supports("shallow"))
 		die("Server does not support shallow clients");
 	if (server_supports("multi_ack")) {

@@ -573,10 +574,6 @@ static struct ref *do_fetch_pack(int fd[2],
 			fprintf(stderr, "Server supports side-band\n");
 		use_sideband = 1;
 	}
-	if (!ref) {
-		packet_flush(fd[1]);
-		die("no matching remote head");
-	}
 	if (everything_local(&ref, nr_match, match)) {
 		packet_flush(fd[1]);
 		goto all_done;

@@ -650,7 +647,7 @@ static void fetch_pack_setup(void)
 int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 {
 	int i, ret, nr_heads;
-	struct ref *ref;
+	struct ref *ref = NULL;
 	char *dest = NULL, **heads;
 
 	nr_heads = 0;

@@ -706,9 +703,34 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 	if (!dest)
 		usage(fetch_pack_usage);
 
-	ref = fetch_pack(&args, dest, nr_heads, heads, NULL);
+	int fd[2];
+	struct child_process *conn = git_connect(fd, (char *)dest, args.uploadpack,
+                          args.verbose ? CONNECT_VERBOSE : 0);
+	if (conn) {
+		get_remote_heads(fd[0], &ref, 0, NULL, 0);
+
+		ref = fetch_pack(&args, fd, conn, ref, dest, nr_heads, heads, NULL);
+		close(fd[0]);
+		close(fd[1]);
+		if (finish_connect(conn))
+			ref = NULL;
+	} else {
+		ref = NULL;
+	}
 	ret = !ref;
 
+	if (!ret && nr_heads) {
+		/* If the heads to pull were given, we should have
+		 * consumed all of them by matching the remote.
+		 * Otherwise, 'git-fetch remote no-such-ref' would
+		 * silently succeed without issuing an error.
+		 */
+		for (i = 0; i < nr_heads; i++)
+			if (heads[i] && heads[i][0]) {
+				error("no such remote ref %s", heads[i]);
+				ret = 1;
+			}
+	}
 	while (ref) {
 		printf("%s %s\n",
 		       sha1_to_hex(ref->old_sha1), ref->name);

@@ -719,16 +741,15 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 }
 
 struct ref *fetch_pack(struct fetch_pack_args *my_args,
+		       int fd[], struct child_process *conn,
+		       const struct ref *ref,
 		const char *dest,
 		int nr_heads,
 		char **heads,
 		char **pack_lockfile)
 {
-	int i, ret;
-	int fd[2];
-	struct child_process *conn;
-	struct ref *ref;
 	struct stat st;
+	struct ref *ref_cpy;
 
 	fetch_pack_setup();
 	memcpy(&args, my_args, sizeof(args));

@@ -737,29 +758,15 @@ struct ref *fetch_pack(struct fetch_pack_args *my_args,
 			st.st_mtime = 0;
 	}
 
-	conn = git_connect(fd, (char *)dest, args.uploadpack,
-                          args.verbose ? CONNECT_VERBOSE : 0);
 	if (heads && nr_heads)
 		nr_heads = remove_duplicates(nr_heads, heads);
-	ref = do_fetch_pack(fd, nr_heads, heads, pack_lockfile);
-	close(fd[0]);
-	close(fd[1]);
-	ret = finish_connect(conn);
-
-	if (!ret && nr_heads) {
-		/* If the heads to pull were given, we should have
-		 * consumed all of them by matching the remote.
-		 * Otherwise, 'git-fetch remote no-such-ref' would
-		 * silently succeed without issuing an error.
-		 */
-		for (i = 0; i < nr_heads; i++)
-			if (heads[i] && heads[i][0]) {
-				error("no such remote ref %s", heads[i]);
-				ret = 1;
-			}
+	if (!ref) {
+		packet_flush(fd[1]);
+		die("no matching remote head");
 	}
+	ref_cpy = do_fetch_pack(fd, ref, nr_heads, heads, pack_lockfile);
 
-	if (!ret && args.depth > 0) {
+	if (args.depth > 0) {
 		struct cache_time mtime;
 		char *shallow = git_path("shallow");
 		int fd;

@@ -787,8 +794,5 @@ struct ref *fetch_pack(struct fetch_pack_args *my_args,
 		}
 	}
 
-	if (ret)
-		ref = NULL;
-
-	return ref;
+	return ref_cpy;
 }

@@ -16,6 +16,8 @@ struct fetch_pack_args
 };
 
 struct ref *fetch_pack(struct fetch_pack_args *args,
+		int fd[], struct child_process *conn,
+		const struct ref *ref,
 		const char *dest,
 		int nr_heads,
 		char **heads,

@@ -563,6 +563,8 @@ struct git_transport_data {
 	unsigned thin : 1;
 	unsigned keep : 1;
 	int depth;
+	struct child_process *conn;
+	int fd[2];
 	const char *uploadpack;
 	const char *receivepack;
 };

@@ -593,20 +595,20 @@ static int set_git_option(struct transport *connection,
 	return 1;
 }
 
+static int connect_setup(struct transport *transport)
+{
+	struct git_transport_data *data = transport->data;
+	data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
+	return 0;
+}
+
 static struct ref *get_refs_via_connect(struct transport *transport)
 {
 	struct git_transport_data *data = transport->data;
 	struct ref *refs;
-	int fd[2];
-	char *dest = xstrdup(transport->url);
-	struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
 
-	get_remote_heads(fd[0], &refs, 0, NULL, 0);
-	packet_flush(fd[1]);
-
-	finish_connect(conn);
-
-	free(dest);
+	connect_setup(transport);
+	get_remote_heads(data->fd[0], &refs, 0, NULL, 0);
 
 	return refs;
 }

@@ -617,7 +619,7 @@ static int fetch_refs_via_pack(struct transport *transport,
 	struct git_transport_data *data = transport->data;
 	char **heads = xmalloc(nr_heads * sizeof(*heads));
 	char **origh = xmalloc(nr_heads * sizeof(*origh));
-	struct ref *refs;
+	const struct ref *refs;
 	char *dest = xstrdup(transport->url);
 	struct fetch_pack_args args;
 	int i;

@@ -632,13 +634,27 @@ static int fetch_refs_via_pack(struct transport *transport,
 
 	for (i = 0; i < nr_heads; i++)
 		origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
-	refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
+
+	refs = transport_get_remote_refs(transport);
+	if (!data->conn) {
+		struct ref *refs_tmp;
+		connect_setup(transport);
+		get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0);
+		free_refs(refs_tmp);
+	}
+
+	refs = fetch_pack(&args, data->fd, data->conn, transport->remote_refs,
+			  dest, nr_heads, heads, &transport->pack_lockfile);
+	close(data->fd[0]);
+	close(data->fd[1]);
+	if (finish_connect(data->conn))
+		refs = NULL;
+	data->conn = NULL;
 
 	for (i = 0; i < nr_heads; i++)
 		free(origh[i]);
 	free(origh);
 	free(heads);
-	free_refs(refs);
 	free(dest);
 	return (refs ? 0 : -1);
 }

@@ -721,6 +737,7 @@ struct transport *transport_get(struct remote *remote, const char *url)
 		ret->disconnect = disconnect_git;
 
 		data->thin = 1;
+		data->conn = NULL;
 		data->uploadpack = "git-upload-pack";
 		if (remote && remote->uploadpack)
 			data->uploadpack = remote->uploadpack;